package com.njwb.day03;

public class Test13 {
    public static void main(String[] args) {
        //数组：引用数据类型
        int[] is=null;
        //System.out.println(is);
        //NullPointerException:空指针异常
        System.out.println(is[0]);
        is[0]=10;
        System.out.println(is.length);



    }
}
